Mounting for acoustic horns



Nov. 1, 1927. v

D. H. Moss MOUNTING FOR AcousTic HORNS Filegi Feb. 1 1924 @QY/c/ M055 INVENTOR.

A TTORNE Patented Nov. 1, 1927.

UNITED STATES 1,647,462 PATENT OFFICE.

DAVID E. MOSS, OF BROOKLYN, NEW YORK, ASSIGNOR, IBY MESNE ASSIGNMENTS, TO

BRANDES LABORATORIES INC., NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

MOUNTING FOR ACOUSTIC HORNS.

Application filed February 13, 1924. Serial no. 692,560..

My invention relates broadly to electricaf sound reproducers, and more particularly to amounting for an acoustic horn upon the casing of an electromagnetic sound repro- & ducer.

One of the objects of my invention is to provide a rigid connection between an acoustic horn and the casing carrying the electromagnetic operating mechanism of an w electromagnetic sound reproducer, enabling the acoustic horn to be quickly placed in position and securely anchored against removal.

Another object of the'invention is to provide a construction of ferrule for the base of an acoustic horn enabling the ferrule to be;

come substantially embedded in the material of the horn to such a degree that it forms practically a unitary part of the horn, insuring against the removal of the body of the horn from the ferrule by accident, shocks and jars, or other reasonable mechanical strains to which acoustic horns may be subjected.

Still another object of my invention is to provide 'a tapered ferrule having a plurality of biting ribs co-extensive with the interior slanting walls 'of the ferrule with a shoulder arranged at the lowermost extremities of the ribs and the outer surface of the lower extremit of the ferrule threaded to enter the casing of the electromagnetic mechanism in such manner that the acoustic horn becomes firmly anchored within the ferrule with the lower extremity of the horn abutting the annular shoulder within the ferrule, the exterior walls of the horn adjacent the end thereof'being firmly embedded in the biting ribs.

40 M invention will be more clearly understoo by reference to the following specification: and the accompanying drawings, in which:

Figure 1 is a view of my acoustic horn mounting in vertical cross section with the electroma etic mechanism casing shown partially in side elevation; Fig. 2 is a cross sectional view taken through line 2-2 of Fig. 1 illustrating the biting ribs employed in the ferrule 3 and Fig. 3 is a diagrammatic assembly view illustrating the horn and electromagnetic mechanism substantially associated together by means of the horn mounting of the present invention.

' Remotes? it has been t p actice to mount acoustic horns with relation to an electromagnetic operating mechanism by depending upon a cement connection between thehorn and the casing of the electromagnetic mechanism.. I have found that in quant ty production of sound reproducers util z ng such horn mountings that there areimperfections in such connections resultmg in an unduly large number of rejections by reason of the horn becoming loose from its mounting. In many cases the cement does not adhere to the surface of the horn sufficiently to even restrain the horn against removal when the instrument is raised from a. support. -I-n such instances the weight of the-electromagnetic parts is often suflicient to cause the acoustic horn to leave the electromagnetic operating mechanism. The

weight of the electromagnetic operating mechanism'is often" such as to exert a con- 7 siderable downward force under the action of gravity when the instrument is raised by grasping a part of the acoustic horn, resultmg m the withdrawal of the horn from the casing of the electromagnetic mechanism.

My present invention avoids this difiiculty heretofore experienced. I provide a tapered ferrule member between the casing of 'the electromagnetic mechanism and the lower extremity of the acoustic horn, and within this ferrule I provide biting ribs which enter the material of the horn in the assembly of the instrument to such a degree as to form a substantially unitary structure insuring against the removal of the horn from the electromagnetic operating mechanism.

Referring more particularly to the drawings, reference character 1 indicates the acoustic horn supported in relation to the cap 2 of the casing 3 containing electromagnetic operating mechanism 4 and diaphragm 5. The means which I employ for mounting acoustic horn 1 with relation to cap 2 comprises a tapered annular ferrule 6 having substantiallyfihe same inclination as the walls of the acoustic horn 1. At points a spaced about theinteriorperipherv of the ferrule 6 I provide a plurality of biting ribs 7, 8 and 9 substantially V-shaped in cross section and co-extensive with the interior 10 walls of the ferrule 6 terminatin at an annular shoulder 10.- Depending rom the annular shoulder I provide a screw threaded'shank 11 arranged with relation to the tapered walls of the ferrule 6 in such man- 1 1 2. A mounti tially unitary structure and securely; gripping the horn in position w1th respect to the electromagnetic mechanism. The shoulder 14 abuts against the top of easing 2 when the screw threaded shank 11 is screwed to its limit into the casing.

As illustrated in Fig. 3, the completeassembly of the acoustic horn and electromagnetic mechanism may be mounted in base 15 and the connection between the electromagnetic mechanism and the horn 1 insured in strength and rigidity by reason of the interior ribbed construction of'the ferrule 6.

able glue forming a film between the interior tapered walls of the ferrule 6 and the The connection is further insured by a suitexterior walls on the lower extremity of theacoustic horn 1. 1

It will be appreciated that my horn mounting is extremely simple in construction and capable of quantity production with negligible loss on account of rejections which have heretofore been a source of continued inconvenience.

What I claim and desire to secure by Letters Patent of the United States is as folows:

1. A mounting for an acoustic horn having a tapered end, comprising a casing having an aperture corresponding to the diameter of the lower extremity of said acoustic how, an annular ferrule having its walls inclined in a direction substantially in alignment with said taper of theacoustic horn, a

screw threaded'shank on the lower portion of said ferrule arranged to be secured within said casing, and a plurality of biting ribs spaced one from the other on the interior of said ferrule arranged to be embedded into the material of said acoustic horn whereby to resist removal of said horn from said casing. a

ing tapering si e walls comprising, a casing having an aperture corresponding to the Y diameter of the lower extremity of said acoustic horn, and an annular ferrule positioned intermediate said casing and the lowermost extremity of said horn, said ferrule comprising a screw threaded shank arranged to enter said casing, and a tapered annular wall portion on said ferrule with means protruding inwardly from said wall portion for entering the'material of said acoustic horn at a plurality of points around the lowermost extremity of said horn whereb to form a rigid connection between said 10m and said casing.

3. A mounting for an acoustic horn having its lower extremity tapered, a casing aperturedfto conform with the lower extremity of said acoustic horn, a ferrule located intermediate the lower extremity of said acoustic horn and the upper portion of said casing, said ferrule including a wall portion arranged to surround the lowcr extremity of said acoustic horn, and a plurality of V-shaped members connected to said wall portion at points spaced around the interior-of said ferrule andadapted to enter the material of said acoustic horn whereby a substantial connection between said horn and said casing is secured.

4. A mounting for an acoustic horn having a tapered lower extremity, a casing having an aperture corresponding to the. diameterof the lower extremity of said acoustic horn, an annular ferrule having its walls inclined in a direction substantially in alignment with the taper of the acoustic horn. a screw threaded shank on the lower portion of said ferrule arranged to be secured within said casing, an annular shoulder within said ferrule arranged to form a seat for the lower extremity of said acoustic horn, and a plurality of longitudinally extending ribs protruding from the interior walls of said ferrule at a plurality of points about vthe circumference thereof and extending from said shoulder to the extremity of said ferrule, each of said ribs being located on a diametrical line different from a diametrical' line .on which another of said ribs is located,

for an acoustic horn hav-- and arranged to be embedded into the material of said acoustic horn whereby to form a rigid connection with said horn.

t In testimony whereof I aflix my signaure.

DAVID H- OS 

